docs: def _sam_to_soft_clipped(self, sam):
          '''Returns tuple of whether or not the left and right end of the mapped read in the sam record is soft-clipped'''
          if sam.is_unmapped:
              raise Error('Cannot get soft clip info from an unmapped read')
  
          if sam.cigar is None or len(sam.cigar) == 0:
              return False, False
          return (sam.cigar[0][0] == 4, sam.cigar[-1][0] == 4)